Siemens SINAMICS G120D - Optimizing the Speed Controller

Setting functions
8.5 Motor control
Converter with control units CU250D-2
142 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
8.5.2.3
Optimizing the speed controller
Optimum control response - post optimization not required
You do not have to manually adapt the speed controller if, after the speed controller self
optimization, the motor manifests the following acceleration response:
Optimum control response for applications that do not permit
any overshoot.
The ac
tual value approaches the setpoint without any
significant overshoot.
Optimum control response for fast correction and quick
compensation of noise components
.
Th
e actual value approaches the setpoint and slightly
overshoots, maximum 10% of the setpoint step.
Control optimization required
In some cases, the self optimization result is not satisfactory, or the inverter cancels the self-
optimization routine with a fault. Further, self optimization is not permissible in plants and
systems in which the motor cannot freely rotate.
In these cases you must manually optimize the speed controller.
The examples listed below show you which variables you can use to adapt the control
response.
The basic procedure is described in the following section for STARTER and the operator
panel.
Depending on whether the control operates with or without encoder, different parameters
define the controller response.
K
p
T
n
Encoderless speed control
p1470
p1472
Speed control with encoder
p1460
p1462